Measurement Research Multiple Choice

In a quasi-experiment, the researcher: a)selects participants for different conditions from pre-existing groups b)randomly assigns participants to different conditions c)has complete control over the way the experiment is to be conducted d)all of the above When using Matching as a control strategy, the experimenter should match subjects on a variable that is: a)highly correlated with the independent variable b)highly correlated with the dependent variable c)uncorrelated with the dependent variable d)both a and c Which of the following is a true experimental design? a)one group post test only b)post test-only with non-equivalent control group c)one group pretest-pos... click for more

Experimental Design is overviewed.

Advantages and disadvantages of between subjects and within-subjects experimental designs are shown.

Experimental design question

In an experiment designed to examine the effects of dieting and exercise on weight loss, subjects were randomly assigned to one of four conditions: (1) both dieting and exercise, (2) dieting but no exercise, (3) exercise but no dieting, and (4) neither dieting nor exercise. Results indicated that subjects not on a diet lost only three pounds whether or not they exercised. However, subjects who dieted lost 15 pounds if they exercised and 8 pounds if they did not exercise. a) Is there a main effect for dieting? If so, describe the effect. b) Is there a main effect for exercise? If so, describe the effect. c) Is there an interaction effects? If so, describe the effect. d) Is this a true e... click for more

Invalidity is discussed.

An educational psychologist is asked to conduct a study to determine if class size has an effect on academic achievement. The psychologist identifies a large fifth-grade classroom in one inner-city school and a small fifth-grade classroom in another inner-city school. Principals from each school agree to participate in the study and select the teachers and classes. At the end of the school year, the researcher obtains achievement test scores from students in both schools and compares the mean achievements of the two groups. Based solely on the preceding description, this job names threats to internal or external validity exist in this study and an alternative method that would strengthen ... click for more

Sources of Validity are noted.

An educational psychologist is asked to conduct a study to determine if class size has an effect on academic achievement. The psychologist identifies a large fifth-grade classroom in one inner-city school and a small fifth-grade classroom in another inner-city school. Principals from each school agree to participate in the study and select the teachers and classes. At the end of the school year, the researcher obtains achievement test scores from students in both schools and compares the mean achievements of the two groups. Based solely on the preceding description, this job lists threats to internal or external validity exist in this study and any alternative method that would strengthen... click for more